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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf8b59e82ba279172142a1870a596a74b1fb45b77dcde86a0e6fec5c116ff0d' 
  AND token = 'iJDcIPO71WvVACkr4Bjlmr275lPo8/qELbj51ZgBukc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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