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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d519ef8f6a6e5c8066731571dd58c8c45688020e766b8886d7bbbd83c0f738' 
  AND token = '2Tojj+3J7wpHrxQNKHV/7XJRr2UWkbs9nsib1TjhvmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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