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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32611f1a47fc0a992934f1d78a15ed3bd1aef459638779373039f4e46ba65277' 
  AND token = 'e29sQx33Ale9M7WGhmsJ+3yJol1N3IILYZe9gx8GhbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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