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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771702d8e1e59d22b8268b056ff030caf98e84a0ef34d1021654b61b192507cd' 
  AND token = '7KAkK7m+/bIQVw74fS09KkG8EulEF3wRKqQ8eQift+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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