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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081a645fa56ebbfb83bcd6445f5b8e0febe414c2d6c3c7a8c401432ab631cedc' 
  AND token = 'lGF5gFMtuREGGMha/S8tBGzFePZzh20PIvmWtOzf/G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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