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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81b7f8fed0f6b9b99b20d944a6d817223a2452b54f09f961cbbe2c6ccf5ecc3' 
  AND token = 'Q0uiLivZ8cvxNmOOaKciZCpArVOGcEPs1S4+gLj8vk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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