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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0a6749f2c763c6b86c7b0c06d89afff2238f16712866f821e3200d2dac9362' 
  AND token = 'W67YcYnYcEWV1ENDCteSvn/i2MWjL/GgJmRi0OCNOkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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