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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a8a349ff96cd4cccb0e7e96fa9bccb63b99792597f3b80ee29ea097c5695bf' 
  AND token = 'QieBfbH37W8bff/izrnV+qx2f3Pd3BcnXfKt+nnZHq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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