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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78752949a7929a3ae7666d70dd03fd9374217a563f2914d56d6c50aea507fd6' 
  AND token = 'tw4+o/1z59TZBRdW7d+wSprTV5/crtiZgGYJHKS/D5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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