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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4e894318d5d1d902e502b3ba3d71487bf32645bc89a3eeb79c411c7911afe4' 
  AND token = 'gUztorIQDSj/klVmT0V9UnSqh8gO1A75KAe2zX4Be5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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