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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5c6a39fc07e676a838a6a15d24e9b784edf47c4cf5544f3f23f9d28dda7a93' 
  AND token = 'TiyZFWf4AXt2EDuVBh98aNaHQVLo0fHzwR3lRd+PRdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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