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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd7c7368b2e6fcc3d5a242acde5177722d0bced8c0a6c63535a58a90d0756f6' 
  AND token = '+ZuMr2WydcgEjuxoDFZEJ7WTx8xcqjZlsEoLm3SLZ1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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