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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4bf3397ebf68327428a00d9928e469c38ac92455179f84071d3edb8643e89b' 
  AND token = 'kazqGUmheHn187X8Mait5fsBRKK3WWytMp0t1DgPXp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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