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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd174fc3810e34bb166c14ebfa7805695ba35a68d9b39a94e29f836a7f720f0b8' 
  AND token = 'N/OJQj32sxEoyumNjuMwEn0XVkn1vCx1pVJHN9fpnrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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