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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66dcd2b2f4a90762beb01b73845b4ff49237c3fa3b61d86c0eb5a2b08284ac51' 
  AND token = 'Ps8tvqCJ3q6hlWA90bKM8D2daq/kHEhKJlVrSsacBjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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