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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3100859f5a03e69a4164749c8c1ce5c7ae6e36c11f6b3c688341a4446794073b' 
  AND token = '3xidvp6v3UM71brQumdVVC5CVhbzy79heQp39Afnr4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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