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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e58140edaf1cd2d732a70d85bb42f4cd8654151758e5fdae1f59871f9692698' 
  AND token = 'IuEIcMhABu+KK6ily5yRjVPxy/5kE+QoYiQ89P6RZz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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