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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb71fff2e18e9f23543862e5d29bbe336deae8262965b05a2cc5bdc6b1d2546' 
  AND token = 'uixaJ3I8IYItG7/7JEzrbi6vEpAXHURzd/BBTYtx1/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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