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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0ae4e49059eb633f45fbde6c89971c49f347712c436063a5d2b09f4fb70f02' 
  AND token = 'AmeCjH26HC/kMeGFGfi94YEvN0JB3PRsgMApTu1J9N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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