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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b235e71186ddee6fa5ecaf4fc08008431c9c758fd6c482fb8a8ac001c62b33' 
  AND token = 'FfUH5je+PZLjNuo+97E4HusNraQRLtPKM1qn5aVL/aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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