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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca2a27b3aa7006afec6cc9fed37f70fa8f6bcc0c27cb725d0f1ebb6be9823a1' 
  AND token = 'k7+7utygZy46toH4CHR/U9zOKa9IbhJ02jI+Vm3W374=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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