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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba9b8512f13d31f04ac45863bcde618e4eea7dec08ca99e1c5eb69458f1e7ea' 
  AND token = 'ZPQ3uq8ibu3CfLZTg5nvR93DHoIpwWC+UEFKzC16afE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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