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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aac89a277524ec85546d5ce34c384f43c773a7465f41c8d7e327f6c564fa767' 
  AND token = '5aKuMZRaR3+ySLxjk5WjmC1i4bK9jtcJpxq9XICaEFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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