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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5554936a21c5b7978c22a1d29514dfd01c72b3287ebd99d071d4e660c55254dd' 
  AND token = '1cs84+SL1iF+f9d52/R7DmyA3tWD4YPNBGRn57ydzNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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