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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f20eeb72d399ae7e7d95733ead5283388fa8a57fe61d52a3a20c335fd82e48' 
  AND token = 'nX/I4tzu5wE1J5bzmL4gwNKgowNJr/VanJ1kzcNLLSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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