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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a332956668afb7aaae38d84dc21604623582635e0015e18efedd0b347b88fa76' 
  AND token = 'zQrpVUUNHTSsx1keQi8gjZZI3RHxCGYUqu7O0a3TKno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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