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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9686933b410fe7ce9b40169ad10dc263f78d30d983d03fa318ae55dfd39ce10b' 
  AND token = 'nvJWscYhJOx74J564UvWwLeS3rSG2cuNk3B2OzkP5zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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