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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8eebccdf30728a54efa719d5dac0d6bceae6c21266d612e64d59e147ab949b' 
  AND token = 'L0jf047mFwzTMOOfJPZ9O8ze0Yf0LmXTBwZeSeGowHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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