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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19525ab19d534c46a90c95725525377976d4af68e3199fd38e4296903bc56504' 
  AND token = '6HHHu//h8ynI9Zn0+YvDVX3V/t/tnOfhpju5hUA3WE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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