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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c03118c8013c8d1737f2ece96821b1a2942d6268bacc8da4b0f2f8d06f3d0e7' 
  AND token = 'sqeKr1ht6CERMLQ6rh53LIDlklyh1VW6CijdxNaUxRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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