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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d6a07e727ca0134c66a9c92dc0bcb7d734c1715bcd35f79f6d2e632c5791a2' 
  AND token = 'gg14iLIZvobyCffq4g6MXq1zD44UKvF/mqkNr4L+sa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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