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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c836416330b85d461bd43e7d730d84c0756f79ffc18686963383b005943a4384' 
  AND token = 'gxP37Byx381FHIXeEa0/EP0v4MEiNnK+XDrgPw8ggBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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