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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1daa8216b8ccbb081379acb36eadeb4036138d1847ca1283dc5dc02c879dd5' 
  AND token = 'JDL0nKWl/5geJs8i6/47ulb5WJFlF2cgd7LidoH+gL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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