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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb6fb283195ee615eb21a20c58f9fa39a1fb51b7f4abca84eea234b674c958a' 
  AND token = 'W5VxUCAGDbNsedC0mXTVGaly0CHv/dhm+uvpBgpjuj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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