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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b964ed5415ebd29895aaf50662d0999a1d71b838fd8f1a908648217a9b2e6d79' 
  AND token = 'v/8n7hN+6POzq5yDX0kRfRyVyXgGImi48xaWTnhk7ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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