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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a99c740a362752de9a764c52ba863bc923ae7dbd4d2d7e58fa75e65f4a59d7' 
  AND token = '078SbWgwGRLaV8cN+qI+w5RBOmStKCz4KCwdKUNltAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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