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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294a93ef2c8a625425c192257a78009e112ea09a06ed70c8b3a0e27d9b50c2f5' 
  AND token = 'dY8ftSHZIXEzabfnzw219k6QZfgrdhEVK4RvftcZFyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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