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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b86d895ba3363c5ffa98a6feb774a840d4063366fad14a343c8fc7c93d77fa' 
  AND token = 'dBcNQpFT3lkxpuF0DS8k0W5mbPrMUunwZUOgKaDSEPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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