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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6852f64431dbcfbc5472770d176d9ed9377310350bcb76c411208a3fde146026' 
  AND token = 'vjI1ptFzqysNTf2wX13yhnbHhtLMTVwPxX60suVpuqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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