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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5f1254049ab0b462e4a0dccd8edab60566a89b7280bc754a06caa83119922f' 
  AND token = '3b1kPCXG9b1IoMRyleYaQWnsON6HbbC/CrNBNannyag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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