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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c130dc8d7692ac4abdeb180b9431b026219ca349cbcf3753c4aa0af419f3265b' 
  AND token = 'FsGgrRu/K5osWdSzQgTCY9uUaWi6pSQ1R4cbnBaNCPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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