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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbbd8e44e6607fd1af4ba995818ac8d76f22e6d394a33b8dc37f3aad461f6ba' 
  AND token = '8Nd9ym2UeLzd8/8KRWwVPALzmIAU2w192shTQ/Vh4J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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