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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a8fad2063891fea72c16fb84140951dbc8bac5b32e3d31171043e8e85c0fd4' 
  AND token = 'Zr9FqyZw01F3kskcEqumJR/PsMHhtsQXiHnB/tnQRnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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