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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db123dd6d8a46b3cb77ab23bbc924232a09c413ee5b27efc07679b788dc4a7c6' 
  AND token = 'C4shi5xVSbFtfmJlIzmqv8Ydm280tdqIyTPLqVAHBAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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