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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32d6d22b52484da832d93f86a4474a5d364f3f9786d1ddd4ce9cced8eaa0351' 
  AND token = 'hjmCaIFzrGe5L6DBGYvXxe+xiQkBtmY93anM6qDh+6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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