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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddfb383d07d603019106164d13e23f2c1bfe09d2a3d4d218e3cdd656771b780' 
  AND token = 'ML3dVrqm97Z/m2assXBLP46yKFDy7fqa7qFg3kwYnrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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