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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6181f175291b4faa036ae3fbd3356a482b3971d10e545080071ab99452367bcb' 
  AND token = '9rTsRgMxrRiFlRC8bWVRYrT0uRmfCNfxvv6dYtu14qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}