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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb3e2e6eff60875bcea1aaa6add66e680f03883f739e36b3a67185b30f32719' 
  AND token = 'k1jaJzjwFmhoNyxpS4A209KJzh2Fl08V2gcZvNcF6aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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