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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6214d617b66cd6a027db4689fc3f234ce8d627ad224604fb9d2e977296deeb86' 
  AND token = 'L30ptLuHvKkBYzP2aY/0b9C3H/csQv7zZ/JdaFCohAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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