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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ed5a4f33353d35f8c157a2ee79a53c20108897803b7bd46c2e5caa49eb9557' 
  AND token = 'gT2W+X/qotDOrvHNtKzmo36k3kruC7eJ/plg8eqSa/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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