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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56a2d0621565acea3483a9379ccda7467c88d51324a11212fa3a1bde8e94c57' 
  AND token = 'wl618F1hc/FlmlBQVeUoF1X34f1KrVBck4QMMLA5Gso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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