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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63aa1790666cc31486ec61233c3f7dd724a80696590ff1ff7a83b4125b3706dd' 
  AND token = 'YnWocyn2DUaPIU7O7J7J3HcsH/NmcS1diYxDn4Qq2pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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