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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd5efa8caa2f108167002daa4b98447b512b3312f16f1989bdd743ddc777617' 
  AND token = 'o1q2TUhAaqXZiAwuoY362Dvk0WbeZYEraRzKMOAA0aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00141

JSON explain

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