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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f9f306aaa4d461f6593a391268447895598116c419e36d5a12de028753c6e7' 
  AND token = 'lrwZMkEQcYRprIV8BBTdZS4PaDq9YTUsY7NNdVSo96M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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