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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a3bb842b6c8f80b2f1720a2587f2aa5b2145e84b488f8d36d33a8fab6b1c34' 
  AND token = 'r7vRaRr0iCgoEYNY36+gV11IYHkDitWPsm79bofXUrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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