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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b954472ceaa5e51003bf1d1ea81c86c24f79d44b8198204d5734d8e9fbd25a' 
  AND token = 'tHaNH5KlUIJtwnCcmnPoUE6xy9rFS+016gN/MiGiHT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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