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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be3a95a13b95e51022bc527a8b3581c0e6bf00be61b2bb4ce76a79651f418d0' 
  AND token = 'lE0hB7uudsq/erzpyqVGAImEt9ddMuWkNZczYa0zxcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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