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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3637ac7665d8adb26e0ea0514ba91b118ea00688556c0d9aaeb05a3b1cbe9b1d' 
  AND token = '8RtuBV4rXIv0hT1Y+DOuDaOx0EPQvEWjhGuXwVfU8PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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