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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9f794482deb3ff1bc03ca154532342eefd5347ff375135c3ec7a11fb241ef0' 
  AND token = 'cCoRsh8RQMLEVQV6F/1sypPsk47aiHhivook8S+pnuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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