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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c388f4f0b365c6c8d41ae05361cd5a3a9edd50bde1b6248fb7a98464b9c5e9' 
  AND token = 'g39Z8tNATxnoiyUy17rOMIPokF2N15lK3Kh/J9NroDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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