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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b330cdd3b5bac411988b055c3cde73a4d2da52a6d050712ad015189aa9758ad3' 
  AND token = 'fM7FpAAIujgHXDoSJKTan5X4LyzV1xdPhNMwRgrD/AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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